In 1979, Tenglong Sealing was established by Mr. Xu, mainly manufacturing sealing and thermal insulation products.

In 1994, Tenglong Sealing expanded to more non-asbestos gland packings and PTFE Products.

In 1998, Fiberglass Products were put into the market.

In 2000, ceramic fiber products producing line came into service.

In 2001, SUNPASS INTERNATIONAL, as the subsidiary company, established by MS. Echo Xu, specialized in the design and manufacturing of ISO tank container spare parts, extending to a new business field different from Tenglong Sealing.

In 2002, Tenglong Sealing was equipped with advanced Germany technology and equipment

In 2004, Tenglong was authorized by ISO organization and executed strictly the process and rules of ISO9001:2008

In 2008, ECHO INDUSTRY LIMITED was established to provide better exporting service.

In 2014, Tenglong moved to a new 6000M2 factory with modern office and workshops.

Sunpas Joined ITCO.

Sunpass authorized 1st agent in India.

In 2015, more braiding producing lines were added.

In 2016, Tenglong/Sunpass Shanghai Branch was established.

Sunpass authorized 2rd agent in Europe.

In 2017, New producing line of graphite sheets is put into use.

The production line of PTFE- rubber sealing gaskets are enlarged.

The advanced facility and the production, research and development ability enable us to customized high-tech sealing gaskets.